Motors, chassis and vehicles

Abstract

The present application provides a motor, a chassis system and a vehicle, including: a rotor core, the rotor core includes a core group, the core group includes a plurality of core segments, the plurality of core segments are stacked, any two adjacent core segments are staggered in a clockwise direction or in a counterclockwise direction, the rotor core is provided with a mounting hole, the mounting hole passes through the core group along the axial direction of the rotor core; a rotating shaft is passed through the mounting hole; a bearing is sleeved on the portion of the rotating shaft outside the rotor core; wherein the bearing is a four-point contact ball bearing. The present application can enhance the overall anti-deformation ability of the rotor of the motor by providing a four-point contact ball bearing, which is beneficial to improving the structural rigidity of the motor, and can reduce the axial movement of the motor when it is working. In this way, the vibration performance of the motor during operation is further improved, and the vibration noise of the motor can be further reduced, greatly improving the performance and market competitiveness of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a motor, a chassis system and a vehicle. Background Art

[0002] With the development of new energy vehicles and power electronics technology, people are increasingly demanding low-noise and comfortable driving environments. As a result, the requirements for the motor performance of new energy vehicles are also getting higher and higher. In related technologies, the vibration noise of the motor of new energy vehicles is relatively large, resulting in high noise when the vehicle is driving and low product performance. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present application provides an electric motor.

[0005] A second aspect of the present application provides a chassis system.

[0006] A third aspect of the present application provides a vehicle.

[0007] In view of this, the first aspect of the present application provides a motor, including: a rotor core, the rotor core includes a core group, the core group includes multiple core segments, the multiple core segments are stacked, and any two adjacent core segments are staggered in a clockwise direction or a counterclockwise direction. The rotor core is provided with a mounting hole, and the mounting hole passes through the core group along the axial direction of the rotor core; a rotating shaft is passed through the mounting hole; and a bearing is sleeved on the part of the rotating shaft located outside the rotor core; wherein the bearing is a four-point contact ball bearing.

[0008] The motor provided in the present application includes a rotor core, a rotating shaft and a bearing.

[0009] The rotor core includes a core group, and the core group includes a plurality of core segments stacked along the axial direction of the rotor core. Any two adjacent core segments are staggered in a clockwise direction, or any two adjacent core segments are staggered in a counterclockwise direction, that is, any two adjacent core segments are staggered in a circumferential direction of the rotor core to form a rotor skew pole. The segmented modular arrangement of the rotor core has the advantages of easy installation and maintenance, and skew poles can be formed between the plurality of core segments.

[0010] By staggering any two adjacent core segments in a clockwise or counterclockwise direction, the cogging torque and torque pulsation can be reduced, thereby reducing electromagnetic vibration. In other words, by dividing the rotor core into a plurality of core segments and staggering any two adjacent core segments in a clockwise or counterclockwise direction, the specific harmonic content in the motor can be effectively suppressed, and the torque pulsation and cogging torque of the motor can be improved, thereby achieving the effect of reducing the vibration noise of the motor.

[0011] Furthermore, the rotor core is provided with a mounting hole, which passes through the core group along the axial direction of the rotor core, the rotating shaft is passed through the mounting hole, the bearing sleeve is arranged on the rotating shaft, and the bearing is located on one side of the rotor core, wherein the bearing is a four-point contact ball bearing.

[0012] The four-point contact ball bearing can enhance the overall deformation resistance of the motor's rotor, which is beneficial to improving the structural rigidity of the motor and can reduce the axial movement of the motor when it is working. In this way, the vibration performance of the motor during operation is further improved, and the vibration noise of the motor can be further reduced, greatly improving the motor's performance and market competitiveness.

[0013] According to the above-mentioned motor of the utility model, it can also have the following additional technical features:

[0014] In some embodiments, optionally, there are multiple core groups, and the multiple core groups are stacked; among two adjacent core groups, one core group is recorded as the first core group, and the other core group is recorded as the second core group; the staggered angle of two relatively arranged core segments in the first core group and the second core group is greater than 0°, or the outer edges of two relatively arranged core segments in the first core group and the second core group overlap; in the first core group, any two adjacent core segments are staggered in a clockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ1; in the second core group, any two adjacent core segments are staggered in a counterclockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ2; wherein, θ1 and θ2 are not equal.

[0015] In this embodiment, the number and distribution positions of the core groups are further defined.

[0016] Specifically, there are multiple core groups, and the multiple core groups are stacked along the axial direction of the rotor core. Among two adjacent core groups, one core group is recorded as the first core group, and the other core group is recorded as the second core group.

[0017] The first type is that the outer edges of two core segments arranged opposite to each other in the first core group and the second core group overlap, that is, the outer edges of two core segments adjacent to each other in the first core group and the second core group overlap. In the first core group, any two adjacent core segments are staggered in the clockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ1. In the second core group, any two adjacent core segments are staggered in the counterclockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ2. Among them, θ1 and θ2 are not equal.

[0018] The second type is that the staggered angle of two relatively arranged core segments in the first core group and the second core group is greater than 0°, that is, the staggered angle of two adjacent core segments in the first core group and the second core group is greater than 0°. In the first core group, any two adjacent core segments are staggered in the clockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ1. In the second core group, any two adjacent core segments are staggered in the counterclockwise direction, and the staggered angle of any two adjacent core segments is recorded as θ2. Among them, θ1 and θ2 are not equal.

[0019] Specifically, the positioning surface and the positioning line are defined. Specifically, the line between the center of the mounting hole and the center of the magnet slot of the rotor core extends along the axial direction of the rotating shaft to form the positioning surface, and the line between the center of the portion of the rotor core located between two adjacent magnet slots and the center of the mounting hole is the positioning line. The angle θ between the positioning line and the positioning surface is the positioning angle. When the core segment rotates along the circumference of the rotor core, the positioning surface is set to remain stationary, one end point of the positioning line (i.e., the center of the mounting hole) remains stationary, and the other end point of the positioning line (i.e., the center of the portion of the rotor core located between two adjacent magnet slots) rotates accordingly. The difference in the positioning angles of two adjacent core segments is the offset angle of the two adjacent core segments.

[0020] That is to say, skew poles can be formed between the multiple core segments of the rotor core. This setting, in conjunction with the four-point contact ball bearing, takes into account improving the torque pulsation and cogging torque of the motor and enhancing the anti-deformation ability of the rotor, which is beneficial to reducing the vibration noise of the motor.

[0021] In some embodiments, optionally, there are multiple bearings, a portion of the multiple bearings are located on the first axial side of the rotor core, and another portion of the multiple bearings are located on the second axial side of the rotor core.

[0022] In this embodiment, the number and distribution positions of the bearings are further defined.

[0023] The bearing is a four-point contact ball bearing. The number of the bearings is multiple. The rotor core has an axial first side and an axial second side that are arranged opposite to each other.

[0024] Some of the plurality of bearings are located on a first axial side of the rotor core, and another part of the plurality of bearings are located on a second axial side of the rotor core.

[0025] This arrangement provides four-point contact ball bearings on both axial sides of the rotor core, thereby increasing the fitting area and fitting angle between the bearing and the rotating shaft, further enhancing the overall anti-deformation capability of the rotor, further improving the structural rigidity of the motor, and reducing the axial movement of the motor when it is working. In this way, the vibration performance of the motor during operation is further improved, and the vibration noise of the motor can be further reduced.

[0026] In some embodiments, optionally, the core segment includes a plurality of stacked rotor punchings, and the rotor core is provided with a connecting structure, and any two adjacent rotor punchings are connected by the connecting structure; the number of connecting structures k is greater than or equal to 2×p, and the k connecting structures are arranged at circumferential intervals along the mounting hole, and p is the number of pole pairs of the motor.

[0027] In this embodiment, the structure of the motor is further defined.

[0028] The core segment includes a plurality of rotor punchings, and the plurality of rotor punchings are stacked. The rotor core is provided with a connection structure, and any two adjacent rotor punchings are connected by the connection structure. The connection structure has the function of installing and fixing the plurality of rotor punchings, which can ensure the bonding force of the plurality of rotor punchings and avoid the occurrence of the plurality of rotor punchings being scattered. The clearance between the plurality of rotor punchings can be ensured, which is conducive to reducing the vibration noise during the operation of the motor, can effectively inhibit the deterioration of the motor performance, and improve the product performance and market competitiveness.

[0029] In addition, the connection structure, the arrangement of multiple core segments (i.e., any two adjacent core segments are staggered in a clockwise direction or a counterclockwise direction) and the four-point contact ball bearings are matched to effectively prevent multiple rotor punchings from loosening, while also enabling the stator-rotor gap of the motor to change periodically, making the magnetic field distribution more uniform, which is beneficial to improving the performance and market competitiveness of the motor.

[0030] Furthermore, the relationship between the number k of the connection structures and the number p of pole pairs of the motor is that the number k of the connection structures is greater than or equal to 2×p, and the k connection structures are arranged at intervals along the circumference of the mounting hole. This ensures that different positions of the rotor punchings can be effectively matched through the connection structures, which is conducive to enhancing the bonding force between multiple rotor punchings, ensuring the balance and consistency of the forces at different positions of the rotor punchings, and further avoiding the occurrence of rotor punchings falling apart.

[0031] In some embodiments, optionally, the connecting structure includes a protrusion and a groove, the first side axial end surface of the rotor punching is provided with a groove, and the second side axial end surface of the rotor punching is provided with a protrusion; in two adjacent rotor punchings, the protrusion of one rotor punching is interference fit with the groove of the other rotor punching.

[0032] In this embodiment, the matching relationship between two adjacent rotor punching sheets and the connecting structure is further defined.

[0033] Wherein, the connection structure includes a convex part and a concave part.

[0034] The first side axial end surface of each rotor punching is provided with a groove, and the second side axial end surface of each rotor punching is provided with a convex portion. That is, along the axial direction of the rotor core, the rotor punching has a first end surface and a second end surface that are oppositely arranged, the first end surface is provided with a groove, and the second end surface is provided with a convex portion.

[0035] When two adjacent rotor punching sheets are assembled, the convex part is inserted into the concave part, and the convex part and the concave part are interference fit, so as to achieve the purpose of assembling the two rotor punching sheets.

[0036] The convex part and the groove cooperate to increase the contact area and contact angle of two adjacent rotor punchings, which is beneficial to improve the stability and reliability of the axial assembly of the two adjacent rotor punchings on the rotor core, prevent the rotor punchings from falling apart, and ensure the structural rigidity of the rotor assembly.

[0037] In some embodiments, optionally, in the core group, the staggered angle between any two adjacent core segments in the clockwise or counterclockwise direction is denoted as θ, the number of core segments is denoted as n, the number of stator slots of the motor is denoted as Z1, and the number of pole pairs of the motor is denoted as p; wherein, θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, Nc=LCM(Z1, 2×p), n≥2.

[0038] In this embodiment, the structure of the motor is further defined.

[0039] In the core group, the relationship between the staggered angle θ between any two adjacent core segments in the clockwise or counterclockwise direction, the number of core segments n, the number of stator slots Z1 of the motor and the number of pole pairs p of the motor is θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, Nc=LCM(Z1, 2×p), n≥2.

[0040] Taking a 12-slot 8-pole motor as an example, it should be noted that the harmonic of the cogging torque of the Z1-slot 2×p-pole motor is mainly Nc=LCM(Z1, 2×p), so for the 12-slot 8-pole motor, the harmonic of the cogging torque is mainly 24th.

[0041] Since there is magnetic leakage in the motor, the magnetic leakage will cause the cogging torque difference.

[0042] To this end, the present application defines θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, so as to effectively reduce the harmonics of the uneliminated cogging torque, thereby effectively reducing the cogging torque of the motor. On the basis of keeping the electromagnetic torque of the motor basically unchanged, the cogging torque can be greatly reduced, thereby further improving the performance and market competitiveness of the motor.

[0043] When the rotor core includes multiple core groups, the maximum number of core segments in the multiple core groups is recorded as n. For example, among two adjacent core groups, one core group is recorded as the first core group, and the other core group is recorded as the second core group. The number of core segments in the second core group is greater than the number of core segments in the first core group, and the number of core segments in the second core group is recorded as n.

[0044] It can be understood that LCM(Z1, 2×p) refers to the least common multiple of Z1 and 2×p.

[0045] In some embodiments, optionally, at least a portion of the hole wall of the mounting hole is interference fit with the rotating shaft.

[0046] In this embodiment, the matching structure of the rotor core and the rotating shaft is defined.

[0047] At least a portion of the hole wall of the mounting hole is in interference fit with the rotating shaft. That is, a portion of the hole wall of the mounting hole is in interference fit with the rotating shaft. Or the entire hole wall of the mounting hole is in interference fit with the rotating shaft.

[0048] This arrangement can ensure the matching structure of the rotating shaft and the rotor core, and avoid the situation where the rotating shaft and the rotor core are separated.

[0049] When a part of the hole wall of the mounting hole is interference fit with the rotating shaft, the contact area between the mounting hole and the rotating shaft can be reduced. That is, while ensuring the use requirement of the interference fit between the rotating shaft and the mounting hole, the radial force formed by the interference fit between the rotating shaft and the mounting hole can be reduced due to the reduction of the contact area between the mounting hole and the rotating shaft, which can reduce the influence of the radial force on the bonding force between the rotor punchings, is beneficial to reducing the probability of deformation of the rotor punchings, and can further reduce the probability of multiple rotor punchings becoming loose.

[0050] Optionally, the hole wall of the mounting hole is a convex-concave wall, the convexity of the convex-concave wall is interference fit with the rotating shaft, and the concave portion of the convex-concave wall is arranged separately from the rotating shaft. The convexity and concave of the convex-concave wall are arranged alternately, and both the convexity and concave extend along the axial direction of the rotating shaft.

[0051] In some embodiments, optionally, the motor further includes: a plurality of permanent magnets, which are provided in the core segment, and the plurality of permanent magnets are arranged at intervals along the circumference of the mounting hole; along the axial direction of the rotor core, the length of the permanent magnet is less than or equal to the length of the core segment.

[0052] In this embodiment, the structure of the motor is further defined.

[0053] The motor also includes a plurality of permanent magnets, which are arranged on the core segment and spaced apart along the circumference of the mounting hole.

[0054] The four-point contact ball bearing can enhance the overall deformation resistance of the rotor core, bearings and multiple permanent magnets, which is beneficial to improving the structural rigidity of the motor and can reduce the axial movement of the motor when it is working.

[0055] Furthermore, along the axial direction of the rotor core, the length of the permanent magnet is less than or equal to the length of the core segment. The core segment has the function of protecting the permanent magnet, thus reducing the probability of squeezing the permanent magnet and thus causing damage to the permanent magnet.

[0056] If the length of the permanent magnet along the axial direction of the rotor core is greater than the length of the core segment, part of the permanent magnet is likely to protrude from the core segment. This arrangement is likely to cause the permanent magnet to be squeezed and damaged, and the performance of the motor cannot be guaranteed.

[0057] Optionally, the permanent magnet is disposed on the outer peripheral wall of the core segment in a surface-mounted manner.

[0058] Optionally, along the axial direction of the rotor core, the core segment is provided with a magnet slot running through it, and the permanent magnet is arranged in the magnet slot.

[0059] In some embodiments, optionally, the rotor core is provided with a plurality of weight-reducing holes, the plurality of weight-reducing holes are arranged at intervals in the circumferential direction of the rotating shaft, and the number of the weight-reducing holes is greater than or equal to the number of pole pairs of the motor.

[0060] In this embodiment, the structure of the rotor core is further defined, so that the rotor core is provided with a plurality of weight-reducing holes, and the plurality of weight-reducing holes are arranged at intervals around the circumference of the rotating shaft. The weight-reducing holes have the function of reducing the overall weight of the motor.

[0061] In addition, any two adjacent core segments are staggered in a clockwise direction or a counterclockwise direction, that is, any two adjacent core segments are staggered in a circumferential direction of the rotor core to form a rotor skew pole. The weight reduction holes can be used as a positioning basis to assemble the rotor core, providing a reliable structural support to ensure the formation of the rotor skew pole.

[0062] Furthermore, the number of the weight-reducing holes is greater than or equal to the number of pole pairs of the motor, and the plurality of weight-reducing holes are arranged at intervals around the circumference of the rotating shaft. In this way, when assembling the rotor core, the plurality of core segments can be positioned from multiple directions and multiple angles, and the matching accuracy of the plurality of core segments can be ensured.

[0063] Optionally, the number of the lightening holes is equal to the number of poles of the motor.

[0064] Optionally, a weight-reducing hole is provided on the magnetic pole center line and / or the pole piece center line of the rotor punching sheet, so as to reduce the moment of inertia and the overall weight of the motor while ensuring that the performance of the motor is not affected.

[0065] In some embodiments, optionally, a section is taken of the rotor core along an axial direction perpendicular to the rotor core, and in the section, a contour line of the lightening hole includes an arc and / or a line segment.

[0066] In this embodiment, the shape of the weight-reducing hole is further defined. The rotor core is sectioned along an axial direction perpendicular to the rotor core, and in the section, the contour line of the weight-reducing hole includes a circular arc, or the contour line of the weight-reducing hole includes a plurality of line segments, or the contour line of the weight-reducing hole includes a circular arc and a line segment.

[0067] This arrangement is easy to process, has low processing cost, and high processing efficiency. In addition, this arrangement can ensure reliability when positioning multiple core segments through the lightening holes.

[0068] In some embodiments, optionally, the bearing and the shaft have an interference fit.

[0069] In this embodiment, the matching structure of the rotating shaft and the bearing is limited so that the rotating shaft and the bearing have an interference fit. This arrangement is beneficial to improving the overall structural stiffness of the rotor core, rotating shaft and bearing, and enhancing the overall deformation resistance of the rotor core, multiple permanent magnets, rotating shaft and bearing, so as to reduce the axial movement of the motor when it is working.

[0070] In addition, the bearing is a four-point contact ball bearing. When the motor is working, it can ensure the balance and consistency of the force on the part where the shaft contacts the bearing, which is beneficial to further reduce the vibration noise of the motor.

[0071] In some embodiments, optionally, the motor further includes: an elastic part, which is sleeved on the rotating shaft, and the bearing is located between the elastic part and the rotor core, and the elastic part is used to apply an axial preload force to the bearing.

[0072] In this embodiment, the structure of the motor is further defined, so that the motor also includes an elastic part, and the elastic part is in contact with the bearing. Specifically, the elastic part is sleeved on the rotating shaft, and the bearing is located between the elastic part and the rotor core. The elastic part is used to apply an axial preload force to the bearing so that the bearing is firmly assembled on the rotating shaft.

[0073] It is understood that the motor includes a housing, a bearing cavity is provided in the housing, and the bearing is located in the bearing cavity. After the motor is assembled, the elastic part is located between the bearing and the cavity wall of the bearing cavity, and the elastic part is squeezed so that the elastic part applies an axial preload to the bearing.

[0074] In some embodiments, optionally, the axial clearance of the bearing is less than or equal to 0.05 mm.

[0075] In this embodiment, the value range of the axial clearance σ of the bearing is further limited so that σ≤0.05 mm. In this way, the axial vibration of the motor can be further optimized to further optimize the vibration noise of the motor.

[0076] It can be understood that when there is no load, the inner ring of the bearing is fixed and the displacement of the outer ring of the bearing from one extreme position to another extreme position along the axial direction of the rotor core relative to the fixed inner ring is recorded as the axial clearance σ of the bearing. Alternatively, when there is no load, the outer ring of the bearing is fixed and the displacement of the inner ring of the bearing from one extreme position to another extreme position along the axial direction of the rotor core relative to the fixed outer ring is recorded as the axial clearance σ of the bearing.

[0077] A second aspect of the present application provides a chassis system, comprising: the motor as in the first aspect.

[0078] The chassis system provided in the present application includes the motor as in the first aspect, and therefore has all the beneficial effects of the above-mentioned motor, which will not be described one by one here.

[0079] Optionally, the chassis system includes a transmission system, a driving system, a steering system (such as an electric power steering system) and a braking system. The chassis system is used to support and install the vehicle engine and its components to form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure normal driving.

[0080] A third aspect of the present application provides a vehicle, comprising: the motor as in the first aspect; or the chassis system as in the second aspect.

[0081] The vehicle provided in the present application includes the motor as in the first aspect or the chassis system as in the second aspect, and therefore has all the beneficial effects of the above-mentioned motor or chassis system, which will not be stated one by one here.

[0082] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0083] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0085] Figure 1 A schematic diagram of the first part of the structure of a motor according to an embodiment of the present application is shown;

[0086] Figure 2 A schematic diagram of the second part of the structure of a motor according to an embodiment of the present application is shown;

[0087] Figure 3 A schematic structural diagram of a rotor core according to a first embodiment of the present application is shown;

[0088] Figure 4 A schematic structural diagram of a rotor core according to a second embodiment of the present application is shown;

[0089] Figure 5 A schematic structural diagram of a rotor core according to a third embodiment of the present application is shown;

[0090] Figure 6 A schematic structural diagram of a core segment according to an embodiment of the present application is shown;

[0091] Figure 7 A schematic structural diagram of a bearing according to an embodiment of the present application is shown;

[0092] Figure 8 A third structural schematic diagram of a motor according to an embodiment of the present application is shown.

[0093] in, Figures 1 to 8 The corresponding relationship between the reference numerals and component names in the figure is:

[0094] 10 motor, 100 rotor core, 110 core group, 112 core segment, 114 first core group, 116 second core group, 118 rotor punching sheet, 120 mounting hole, 140 weight reduction hole, 200 rotating shaft, 300 bearing, 400 connection structure, 410 protrusion, 420 groove, 500 permanent magnet, 600 elastic part, 700 positioning surface, 800 positioning line. DETAILED DESCRIPTION

[0095] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0096] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0097] Refer to the following Figures 1 to 8A motor 10 , a chassis system, and a vehicle according to some embodiments of the present application.

[0098] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 As shown, a motor 10 according to some embodiments of the present application includes a rotor, and the rotor includes a rotor core 100 .

[0099] The rotor core 100 includes a core group 110 .

[0100] The core assembly 110 includes a plurality of core segments 112 .

[0101] A plurality of core segments 112 are stacked.

[0102] Any two adjacent core segments 112 are staggered in a clockwise direction or a counterclockwise direction.

[0103] The rotor core 100 is provided with a mounting hole 120 .

[0104] The mounting hole 120 penetrates the core assembly 110 along the axial direction of the rotor core 100 .

[0105] The rotating shaft 200 passes through the mounting hole 120 .

[0106] The bearing 300 is sleeved on a portion of the rotating shaft 200 located outside the rotor core 100 .

[0107] The bearing 300 is a four-point contact ball bearing.

[0108] The motor 10 provided in the present application includes a rotor, and the rotor includes a rotor core 100 .

[0109] The rotor core 100 includes a core group 110, and the core group 110 includes a plurality of core segments 112 stacked along the axial direction of the rotor core 100. Any two adjacent core segments 112 are staggered in a clockwise direction, or any two adjacent core segments 112 are staggered in a counterclockwise direction, that is, any two adjacent core segments 112 are staggered in the circumferential direction of the rotor core 100 to form a rotor skew pole. The segmented modular arrangement of the rotor core 100 has the advantages of easy installation and maintenance, and skew poles can be formed between the plurality of core segments 112.

[0110] By staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the cogging torque and torque pulsation can be reduced, thereby reducing electromagnetic vibration. In other words, by dividing the rotor core 100 into a plurality of core segments 112 and staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the specific harmonic content in the motor 10 can be effectively suppressed, and the torque pulsation and cogging torque of the motor 10 can be improved, thereby achieving the effect of reducing the vibration noise of the motor 10.

[0111] Furthermore, the rotor core 100 is provided with a mounting hole 120, which passes through the core group 110 along the axial direction of the rotor core 100, the rotating shaft 200 is passed through the mounting hole 120, the bearing 300 is sleeved on the rotating shaft 200, and the bearing 300 is located on one side of the rotor core 100, wherein the bearing 300 is a four-point contact ball bearing.

[0112] The four-point contact ball bearing can enhance the overall deformation resistance of the rotor of the motor 10, which is beneficial to improving the structural rigidity of the motor 10 and can reduce the axial movement of the motor 10 when it is working. In this way, the vibration performance of the motor 10 during operation is further improved, and the vibration noise of the motor 10 can be further reduced, thereby greatly improving the performance and market competitiveness of the motor 10.

[0113] In some embodiments, optionally, Figure 5 As shown, there are multiple core groups 110 , and the multiple core groups 110 are stacked.

[0114] Of the two adjacent core groups 110 , one core group 110 is denoted as a first core group 114 , and the other core group 110 is denoted as a second core group 116 .

[0115] The staggered angle between two oppositely disposed core segments 112 in the first core group 114 and the second core group 116 is greater than 0°, or outer edges of two oppositely disposed core segments 112 in the first core group 114 and the second core group 116 overlap.

[0116] In the first core group 114 , any two adjacent core segments 112 are staggered in a clockwise direction, and the staggered angle between any two adjacent core segments 112 is denoted as θ1.

[0117] In the second core group 116 , any two adjacent core segments 112 are staggered in the counterclockwise direction, and the staggered angle between any two adjacent core segments 112 is denoted as θ2.

[0118] Among them, θ1 and θ2 are not equal.

[0119] In this embodiment, the number and distribution positions of the core groups 110 are further defined.

[0120] Specifically, there are multiple core groups 110, which are stacked along the axial direction of the rotor core 100. Among two adjacent core groups 110, one core group 110 is recorded as a first core group 114, and the other core group 110 is recorded as a second core group 116.

[0121] The first type is that the outer edges of two core segments 112 arranged opposite to each other in the first core group 114 and the second core group 116 overlap, that is, the outer edges of two core segments 112 adjacent to each other in the first core group 114 and the second core group 116 overlap. In the first core group 114, any two adjacent core segments 112 are staggered in the clockwise direction, and the staggered angle of any two adjacent core segments 112 is recorded as θ1. In the second core group 116, any two adjacent core segments 112 are staggered in the counterclockwise direction, and the staggered angle of any two adjacent core segments 112 is recorded as θ2. Among them, θ1 and θ2 are not equal.

[0122] The second type is that the staggered angle of the two core segments 112 arranged opposite to each other in the first core group 114 and the second core group 116 is greater than 0°, that is, the staggered angle of the two core segments 112 adjacent to each other in the first core group 114 and the second core group 116 is greater than 0°. In the first core group 114, any two adjacent core segments 112 are staggered in the clockwise direction, and the staggered angle of any two adjacent core segments 112 is recorded as θ1. In the second core group 116, any two adjacent core segments 112 are staggered in the counterclockwise direction, and the staggered angle of any two adjacent core segments 112 is recorded as θ2. Among them, θ1 and θ2 are not equal.

[0123] Specifically, a positioning surface 700 and a positioning line 800 are defined. Specifically, the line between the center of the mounting hole 120 and the center of the magnet slot of the rotor core 100 extends along the axial direction of the rotating shaft 200 to form the positioning surface 700, and the line between the center of the portion of the rotor core 100 located between two adjacent magnet slots and the center of the mounting hole 120 is the positioning line 800. The angle θ between the positioning line 800 and the positioning surface 700 is the positioning angle. When the core segment 112 rotates along the circumferential direction of the rotor core 100, the positioning surface 700 is set to be stationary, one end point of the positioning line 800 (i.e., the center of the mounting hole 120) is stationary, and the other end point of the positioning line 800 (i.e., the center of the portion of the rotor core 100 located between two adjacent magnet slots) rotates accordingly. The difference in the positioning angles of two adjacent core segments 112 is the staggered angle of the two adjacent core segments 112.

[0124] That is, skew poles can be formed between the multiple core segments 112 of the rotor core 100. This arrangement cooperates with the four-point contact ball bearing, takes into account improving the torque pulsation and cogging torque of the motor 10 and enhancing the anti-deformation ability of the rotor, which is conducive to reducing the vibration noise of the motor 10.

[0125] In some other embodiments, such as Figure 3 and Figure 4 As shown, the rotor core 100 includes a core group 110, and the core group 110 includes a plurality of core segments 112, and any two adjacent core segments 112 are staggered in a clockwise direction, or any two adjacent core segments 112 are staggered in a counterclockwise direction.

[0126] In some embodiments, optionally, Figure 1 As shown, the number of bearings 300 is plural.

[0127] A portion of the plurality of bearings 300 is located on a first axial side of the rotor core 100 .

[0128] Another portion of the plurality of bearings 300 is located at a second axial side of the rotor core 100 .

[0129] In this embodiment, the number and distribution positions of the bearings 300 are further defined.

[0130] The bearing 300 is a four-point contact ball bearing. There are multiple bearings 300. The rotor core 100 has an axial first side and an axial second side that are oppositely arranged.

[0131] Some of the bearings 300 are located on a first axial side of the rotor core 100 , and another part of the bearings 300 are located on a second axial side of the rotor core 100 .

[0132] This arrangement provides four-point contact ball bearings on both axial sides of the rotor core 100, thereby increasing the fitting area and fitting angle between the bearing 300 and the rotating shaft 200, further enhancing the overall anti-deformation capability of the rotor, further improving the structural rigidity of the motor 10, and reducing the axial movement of the motor 10 when it is working. In this way, the vibration performance of the motor 10 during operation is further improved, and the vibration noise of the motor 10 can be further reduced.

[0133] In some other embodiments, at least one four-point contact ball bearing is disposed on the first axial side of the rotating shaft 200 , and at least one non-four-point contact ball bearing is disposed on the second axial side of the rotating shaft 200 . That is, the four-point contact ball bearing is only located on one side of the rotor core 100 .

[0134] In some embodiments, optionally, Figure 2 and Figure 6 As shown, the core segment 112 includes a plurality of stacked rotor laminations 118 .

[0135] The rotor core 100 is provided with a connection structure 400 .

[0136] Any two adjacent rotor punching sheets 118 are connected via a connecting structure 400 .

[0137] The number k of the connection structures 400 is greater than or equal to 2×p.

[0138] The k connection structures 400 are arranged at intervals along the circumference of the mounting hole 120 .

[0139] p is the number of pole pairs of the motor 10 .

[0140] In this embodiment, the structure of the motor 10 is further defined.

[0141] The core segment 112 includes a plurality of rotor punchings 118, and the plurality of rotor punchings 118 are stacked. The rotor core 100 is provided with a connection structure 400, and any two adjacent rotor punchings 118 are connected by the connection structure 400. The connection structure 400 has the function of installing and fixing the plurality of rotor punchings 118, and can ensure the bonding force of the plurality of rotor punchings 118, and avoid the plurality of rotor punchings 118 from being scattered. The clearance between the plurality of rotor punchings 118 can be ensured, which is conducive to reducing the vibration noise during the operation of the motor 10, and can effectively suppress the deterioration of the performance of the motor 10, thereby improving the performance and market competitiveness of the product.

[0142] In addition, the connection structure 400, the arrangement of multiple core segments 112 (i.e., any two adjacent core segments 112 are staggered in a clockwise direction or a counterclockwise direction) and the four-point contact ball bearings are matched to effectively prevent the multiple rotor punchings 118 from loosening, while also enabling the stator-rotor gap of the motor 10 to change periodically, thereby making the magnetic field distribution more uniform, which is beneficial to improving the performance and market competitiveness of the motor 10.

[0143] Furthermore, the relationship between the number k of the connection structures 400 and the number p of pole pairs of the motor 10 is, specifically, that the number k of the connection structures 400 is greater than or equal to 2×p, and the k connection structures 400 are arranged at intervals along the circumference of the mounting hole 120. It can ensure that different positions of the rotor punchings 118 can be effectively matched through the connection structures 400, which is conducive to enhancing the bonding force between the multiple rotor punchings 118, and can ensure the balance and consistency of the forces at different positions of the rotor punchings 118, and can further avoid the occurrence of the rotor punchings 118 being scattered.

[0144] Optionally, a plurality of connection structures 400 are arranged at equal intervals along the circumference of the rotor core 100 .

[0145] Optionally, along the circumferential direction of the rotor core 100 , some of the plurality of connection structures 400 are arranged at equal intervals.

[0146] In some embodiments, optionally, Figure 6As shown, the connection structure 400 includes a protrusion 410 and a groove 420 .

[0147] A groove 420 is formed on the first axial end surface of the rotor punch 118 .

[0148] A convex portion 410 is provided on the second axial end surface of the rotor punching 118 .

[0149] In two adjacent rotor punchings 118 , the protrusion 410 of one rotor punching 118 is interference fit with the groove 420 of the other rotor punching 118 .

[0150] In this embodiment, the matching relationship between two adjacent rotor punching sheets 118 and the connecting structure 400 is further defined.

[0151] The connection structure 400 includes a protrusion 410 and a groove 420 .

[0152] The first axial end surface of each rotor punching 118 is provided with a groove 420, and the second axial end surface of each rotor punching 118 is provided with a convex portion 410. That is, along the axial direction of the rotor core 100, the rotor punching 118 has a first end surface and a second end surface that are oppositely arranged, the first end surface is provided with a groove 420, and the second end surface is provided with a convex portion 410.

[0153] When two adjacent rotor punching sheets 118 are assembled, the protrusion 410 is inserted into the groove 420 , and the protrusion 410 and the groove 420 are interference fit to achieve the purpose of assembling the two rotor punching sheets 118 .

[0154] The protrusion 410 and the groove 420 cooperate to increase the contact area and contact angle of two adjacent rotor punchings 118, which is beneficial to improving the stability and reliability of the axial assembly of the two adjacent rotor punchings 118 on the rotor core 100, preventing the rotor punchings 118 from falling apart, and ensuring the structural rigidity of the rotor assembly.

[0155] Optionally, a portion of the rotor punching 118 is recessed to form the protrusion 410 and the groove 420 .

[0156] A portion of the rotor punching sheet 118 is recessed to form a convex portion 410 and a concave portion 420. Optionally, the rotor punching sheet 118 is integrally punched with the concave portion 420 and the convex portion 410. This structural arrangement simplifies the forming process of the rotor core 100 because the assembly process of the convex portion 410 and the concave portion 420 is omitted, which is conducive to improving the processing efficiency of the product. In addition, the rotor punching sheet 118 integrally punches out the concave portion 420 and the convex portion 410 to ensure the dimensional accuracy of the product.

[0157] In some embodiments, optionally, in the core group 110 , the offset angle between any two adjacent core segments 112 in the clockwise direction or the counterclockwise direction is denoted as θ.

[0158] The number of core segments 112 is denoted by n.

[0159] The number of stator slots of the electric motor 10 is denoted as Z1.

[0160] The number of pole pairs of the motor 10 is denoted by p.

[0161] Among them, θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤∣Δθ / θ0|<0.3, Nc=LCM (Z1, 2×p), n≥2.

[0162] In this embodiment, the structure of the motor 10 is further defined.

[0163] In the core group 110, the relationship between the staggered angle θ between any two adjacent core segments 112 in the clockwise or counterclockwise direction, the number n of the core segments 112, the number Z1 of the stator slots of the motor 10 and the number p of pole pairs of the motor 10 is θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, Nc=LCM(Z1, 2×p), n≥2.

[0164] Taking a 12-slot 8-pole motor 10 as an example, it should be noted that the harmonic of the cogging torque of the Z1-slot 2×p-pole motor 10 is mainly Nc=LCM(Z1, 2×p), so for the 12-slot 8-pole motor 10, the harmonic of the cogging torque is mainly 24 times.

[0165] Since the motor 10 has magnetic leakage, the magnetic leakage will cause a cogging torque difference.

[0166] To this end, the present application defines θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, so as to effectively reduce the harmonics of the cogging torque that are not eliminated, thereby effectively reducing the cogging torque of the motor 10. On the basis of the electromagnetic torque of the motor 10 remaining basically unchanged, the cogging torque can be greatly reduced, thereby further improving the performance and market competitiveness of the motor 10.

[0167] It can be understood that LCM(Z1, 2×p) refers to the least common multiple of Z1 and 2×p.

[0168] When the rotor core 100 includes a plurality of core groups 110, the maximum number of the core segments 112 in the plurality of core groups 110 is recorded as n. For example, among two adjacent core groups 110, one core group 110 is recorded as a first core group, and the other core group 110 is recorded as a second core group, the number of the core segments 112 in the second core group is greater than the number of the core segments 112 in the first core group, and the number of the core segments 112 in the second core group is recorded as n.

[0169] Optionally, |Δθ / θ0|=0.1, |Δθ / θ0|=0.15 or |Δθ / θ0|=0.18.

[0170] Optionally, |Δθ / θ0|=0.2, |Δθ / θ0|=0.22 or |Δθ / θ0|=0.25.

[0171] Optionally, |Δθ / θ0|=0.28.

[0172] In some embodiments, optionally, at least a portion of the hole wall of the mounting hole 120 is interference fit with the rotating shaft 200 .

[0173] In this embodiment, the matching structure of the rotor core 100 and the rotating shaft 200 is defined.

[0174] At least a portion of the hole wall of the mounting hole 120 is in interference fit with the rotating shaft 200. That is, a portion of the hole wall of the mounting hole 120 is in interference fit with the rotating shaft 200. Or the entire hole wall of the mounting hole 120 is in interference fit with the rotating shaft 200.

[0175] This arrangement can ensure the matching structure between the rotating shaft 200 and the rotor core 100, and avoid the rotating shaft 200 and the rotor core 100 from being separated.

[0176] When a portion of the hole wall of the mounting hole 120 is interference fit with the rotating shaft 200, the contact area between the mounting hole 120 and the rotating shaft 200 can be reduced. That is, while ensuring the use requirement of the interference fit between the rotating shaft 200 and the mounting hole 120, the radial force formed by the interference fit between the rotating shaft 200 and the mounting hole 120 can be reduced due to the reduction of the contact area between the mounting hole 120 and the rotating shaft 200, which can reduce the influence of the radial force on the bonding force between the rotor punchings 118, which is beneficial to reducing the probability of deformation of the rotor punchings 118 and can further reduce the probability of multiple rotor punchings 118 becoming loose.

[0177] Optionally, the hole wall of the mounting hole 120 is a convex-concave wall, the convexity of the convex-concave wall is interference fit with the rotating shaft 200, and the concave portion of the convex-concave wall is arranged separately from the rotating shaft 200. The convexity and concave of the convex-concave wall are arranged alternately, and both the convexity and concave extend along the axial direction of the rotating shaft 200.

[0178] In some embodiments, optionally, Figure 1 and Figure 2 As shown, the motor 10 further includes a plurality of permanent magnets 500 .

[0179] A plurality of permanent magnets 500 are disposed on the core segment 112 .

[0180] The plurality of permanent magnets 500 are arranged at intervals along the circumferential direction of the mounting hole 120 .

[0181] Along the axial direction of the rotor core 100 , the length of the permanent magnet 500 is less than or equal to the length of the core segment 112 .

[0182] In this embodiment, the structure of the motor 10 is further defined.

[0183] The motor 10 further includes a plurality of permanent magnets 500 , which are disposed on the core segment 112 and are arranged at intervals along the circumferential direction of the mounting hole 120 .

[0184] The four-point contact ball bearing can enhance the overall anti-deformation capability of the rotor core 100 , the bearing 300 and the plurality of permanent magnets 500 , which is beneficial to improving the structural rigidity of the motor 10 and can reduce the axial movement of the motor 10 when it is working.

[0185] Furthermore, along the axial direction of the rotor core 100, the length of the permanent magnet 500 is less than or equal to the length of the core segment 112. The core segment 112 has the function of protecting the permanent magnet 500, thus reducing the probability of squeezing the permanent magnet 500 and thus damaging the permanent magnet 500.

[0186] If the length of the permanent magnet 500 along the axial direction of the rotor core 100 is greater than the length of the core segment 112, it is easy for a portion of the permanent magnet 500 to protrude from the core segment 112. This setting can easily cause the permanent magnet 500 to be squeezed and damaged, and the performance of the motor 10 cannot be guaranteed.

[0187] Optionally, the permanent magnet 500 is disposed on the outer peripheral wall of the core segment 112 in a surface-mounted manner.

[0188] Optionally, along the axial direction of the rotor core 100 , the core segment 112 is provided with a magnet slot running through it, and the permanent magnet 500 is disposed in the magnet slot.

[0189] In some embodiments, optionally, Figure 2 and Figure 6 As shown, the rotor core 100 is provided with a plurality of lightening holes 140 .

[0190] A plurality of lightening holes 140 are arranged at intervals around the circumference of the rotating shaft 200 .

[0191] The number of the weight-reducing holes 140 is greater than or equal to the number of pole pairs of the motor 10 .

[0192] In this embodiment, the structure of the rotor core 100 is further defined, so that the rotor core 100 is provided with a plurality of weight-reducing holes 140, and the plurality of weight-reducing holes 140 are arranged at intervals around the circumference of the rotating shaft 200. The weight-reducing holes 140 have the function of reducing the overall weight of the motor 10.

[0193] In addition, any two adjacent core segments 112 are staggered in a clockwise direction or a counterclockwise direction, that is, any two adjacent core segments 112 are staggered in a circumferential direction of the rotor core 100 to form a rotor skew pole. The lightening holes 140 can be used as a positioning basis to assemble the rotor core 100, providing a reliable structural support to ensure the formation of the rotor skew pole.

[0194] Furthermore, the number of the lightening holes 140 is greater than or equal to the number of pole pairs of the motor 10, and the plurality of lightening holes 140 are arranged at intervals in the circumferential direction of the rotating shaft 200. In this way, when assembling the rotor core 100, the plurality of core segments 112 can be positioned from multiple directions and multiple angles, and the matching accuracy of the plurality of core segments 112 can be ensured.

[0195] Optionally, the number of the lightening holes 140 is equal to the number of poles of the motor 10 .

[0196] Optionally, a weight-reducing hole 140 is provided on the magnetic pole center line and / or the pole piece center line of the rotor punching sheet 118, so as to reduce the moment of inertia and the overall weight of the motor 10 while ensuring that the performance of the motor 10 is not affected.

[0197] In some embodiments, optionally, the rotor core 100 is cross-sectioned along an axial direction perpendicular to the rotor core 100 , and in the cross-section, the contour line of the lightening hole 140 includes an arc and / or a line segment.

[0198] In this embodiment, the shape of the lightening hole 140 is further defined. The rotor core 100 is cross-sectioned along an axial direction perpendicular to the rotor core 100. In the cross-section, the contour line of the lightening hole 140 includes an arc, or the contour line of the lightening hole 140 includes a plurality of line segments, or the contour line of the lightening hole 140 includes an arc and a line segment.

[0199] This arrangement is easy to process, has low processing cost, and high processing efficiency. In addition, this arrangement can ensure the reliability when positioning multiple core segments 112 through the lightening holes 140 .

[0200] In some embodiments, optionally, the bearing 300 and the rotating shaft 200 are interference fit.

[0201] In this embodiment, the matching structure of the rotating shaft 200 and the bearing 300 is limited so that the rotating shaft 200 and the bearing 300 are interference fit. This arrangement is beneficial to improving the overall structural stiffness of the rotor core 100, the rotating shaft 200 and the bearing 300, and enhancing the overall anti-deformation ability of the rotor core 100, the plurality of permanent magnets 500, the rotating shaft 200 and the bearing 300, so as to reduce the axial movement of the motor 10 when it is working.

[0202] In addition, the bearing 300 is a four-point contact ball bearing. When the motor 10 is working, it can ensure the balance and consistency of the force on the contact part of the rotating shaft 200 and the bearing 300, which is beneficial to further reduce the vibration noise of the motor 10.

[0203] In some embodiments, optionally, Figure 8 As shown, the motor 10 further includes an elastic portion 600 .

[0204] The elastic portion 600 is sleeved on the rotating shaft 200 , and the bearing 300 is located between the elastic portion 600 and the rotor core 100 .

[0205] The elastic portion 600 is used to apply an axial preload force to the bearing 300 .

[0206] In this embodiment, the structure of the motor 10 is further defined, so that the motor 10 further includes an elastic portion 600, and the elastic portion 600 contacts the bearing 300. Specifically, the elastic portion 600 is sleeved on the rotating shaft 200, and the bearing 300 is located between the elastic portion 600 and the rotor core 100. The elastic portion 600 is used to apply an axial preload force to the bearing 300, so that the bearing 300 is stably assembled on the rotating shaft 200.

[0207] It is understandable that the motor 10 includes a housing, a bearing 300 cavity is provided in the housing, and the bearing 300 is located in the bearing 300 cavity. After the motor 10 is assembled, the elastic part 600 is located between the bearing 300 and the cavity wall of the bearing 300 cavity, and the elastic part 600 is squeezed so that the elastic part 600 applies an axial preload force to the bearing 300.

[0208] In some embodiments, optionally, the axial clearance of the bearing 300 is less than or equal to 0.05 mm.

[0209] In this embodiment, the value range of the axial clearance σ of the bearing 300 is further limited so that σ≤0.05 mm. In this way, the axial vibration of the motor 10 can be further optimized to further optimize the vibration noise of the motor 10.

[0210] Optionally, σ=0.045 mm, σ=0.04 mm, σ=0.035 mm, σ=0.03 mm and σ=0.025 mm, etc., which are not listed here one by one.

[0211] It can be understood that when there is no load, the inner ring of the bearing 300 is fixed, and the displacement of the outer ring of the bearing 300 from one extreme position to another extreme position along the axial direction of the rotor core 100 relative to the fixed inner ring is recorded as the axial clearance σ of the bearing 300. Alternatively, when there is no load, the outer ring of the bearing 300 is fixed, and the displacement of the inner ring of the bearing 300 from one extreme position to another extreme position along the axial direction of the rotor core 100 relative to the fixed outer ring is recorded as the axial clearance σ of the bearing 300.

[0212] A chassis system according to some further embodiments of the present application includes: a motor 10 as in any of the above embodiments.

[0213] The chassis system provided in the present application includes a motor 10 .

[0214] The motor 10 includes a rotor, and the rotor includes a rotor core 100 .

[0215] The rotor core 100 includes a core group 110, and the core group 110 includes a plurality of core segments 112 stacked along the axial direction of the rotor core 100. Any two adjacent core segments 112 are staggered in a clockwise direction, or any two adjacent core segments 112 are staggered in a counterclockwise direction, that is, any two adjacent core segments 112 are staggered in the circumferential direction of the rotor core 100 to form a rotor skew pole. The segmented modular arrangement of the rotor core 100 has the advantages of easy installation and maintenance, and skew poles can be formed between the plurality of core segments 112.

[0216] By staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the cogging torque and torque pulsation can be reduced, thereby reducing electromagnetic vibration. In other words, by dividing the rotor core 100 into a plurality of core segments 112 and staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the specific harmonic content in the motor 10 can be effectively suppressed, and the torque pulsation and cogging torque of the motor 10 can be improved, thereby achieving the effect of reducing the vibration noise of the motor 10.

[0217] Furthermore, the rotor core 100 is provided with a mounting hole 120, which passes through the core group 110 along the axial direction of the rotor core 100, the rotating shaft 200 is passed through the mounting hole 120, the bearing 300 is sleeved on the rotating shaft 200, and the bearing 300 is located on one side of the rotor core 100, wherein the bearing 300 is a four-point contact ball bearing.

[0218] The four-point contact ball bearing can enhance the overall deformation resistance of the rotor of the motor 10, which is beneficial to improving the structural rigidity of the motor 10 and can reduce the axial movement of the motor 10 when it is working. In this way, the vibration performance of the motor 10 during operation is further improved, and the vibration noise of the motor 10 can be further reduced, thereby greatly improving the performance and market competitiveness of the motor 10.

[0219] Optionally, the chassis system includes a transmission system, a driving system, a steering system (such as an electric power steering system) and a braking system. The chassis system is used to support and install the vehicle engine and its components to form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure normal driving.

[0220] According to some further embodiments of the present application, a vehicle includes: a motor 10 as in any of the above embodiments; or a chassis system as in the above embodiments.

[0221] The present application provides a vehicle motor 10 or a chassis system.

[0222] The motor 10 includes a rotor, and the rotor includes a rotor core 100 .

[0223] The rotor core 100 includes a core group 110, and the core group 110 includes a plurality of core segments 112 stacked along the axial direction of the rotor core 100. Any two adjacent core segments 112 are staggered in a clockwise direction, or any two adjacent core segments 112 are staggered in a counterclockwise direction, that is, any two adjacent core segments 112 are staggered in the circumferential direction of the rotor core 100 to form a rotor skew pole. The segmented modular arrangement of the rotor core 100 has the advantages of easy installation and maintenance, and skew poles can be formed between the plurality of core segments 112.

[0224] By staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the cogging torque and torque pulsation can be reduced, thereby reducing electromagnetic vibration. In other words, by dividing the rotor core 100 into a plurality of core segments 112 and staggering any two adjacent core segments 112 in a clockwise direction or in a counterclockwise direction, the specific harmonic content in the motor 10 can be effectively suppressed, and the torque pulsation and cogging torque of the motor 10 can be improved, thereby achieving the effect of reducing the vibration noise of the motor 10.

[0225] Furthermore, the rotor core 100 is provided with a mounting hole 120, which passes through the core group 110 along the axial direction of the rotor core 100, the rotating shaft 200 is passed through the mounting hole 120, the bearing 300 is sleeved on the rotating shaft 200, and the bearing 300 is located on one side of the rotor core 100, wherein the bearing 300 is a four-point contact ball bearing.

[0226] The four-point contact ball bearing can enhance the overall deformation resistance of the rotor of the motor 10, which is beneficial to improving the structural rigidity of the motor 10 and can reduce the axial movement of the motor 10 when it is working. In this way, the vibration performance of the motor 10 during operation is further improved, and the vibration noise of the motor 10 can be further reduced, thereby greatly improving the performance and market competitiveness of the motor 10.

[0227] Optionally, the chassis system includes a transmission system, a driving system, a steering system (such as an electric power steering system) and a braking system. The chassis system is used to support and install the vehicle engine and its components to form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure normal driving.

[0228] It is worth noting that the vehicle can be a new energy vehicle, which includes pure electric vehicles, extended-range electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc.

[0229] Optionally, the motor 10 includes: a rotor core 100, the rotor core 100 includes a plurality of core segments 112, the plurality of core segments 112 are stacked, any two adjacent core segments 112 are staggered in the circumferential direction of the rotor core 100, and the rotor core 100 is provided with a mounting hole 120; the plurality of core segments 112 are asymmetrically arranged in the axial direction of the rotor core 100 (that is, any two adjacent core segments 112 are staggered in a clockwise direction or in a counterclockwise direction); a plurality of permanent magnets 500, the plurality of permanent magnets 500 are arranged in the circumferential direction of the mounting hole 120; a rotating shaft 200, which is arranged in the mounting hole 120 of the rotor core 100; a bearing 300, which adopts a rolling bearing, and at least one bearing 300 is a four-point contact ball bearing.

[0230] Optionally, the rotor punchings 118 of the rotor core 100 have protrusions 410 and grooves 420 , and the grooves 420 are in interference contact with the protrusions 410 of adjacent rotor punchings 118 to form connection structures 400 , and the number of connection structures 400 is greater than or equal to 2×p, where p is the number of pole pairs of the motor 10 .

[0231] Optionally, a part of the hole wall of the mounting hole 120 or the entire hole wall of the mounting hole 120 is interference fit with the rotating shaft 200 .

[0232] Optionally, the offset angle between any two adjacent core segments 112 in the clockwise or counterclockwise direction is recorded as θ, where θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, Nc=LCM(Z1, 2×p), n≥2, n is the number of core segments 112, and Z1 is the number of stator slots of the motor 10.

[0233] Optionally, a plurality of permanent magnets 500 are circumferentially arranged on the outer edge of each core segment 112 , and an axial length Lpm of the permanent magnet 500 and an axial length Lr of the core segment 112 satisfy: Lpm≤Lr.

[0234] Optionally, there are a plurality of weight-reducing holes 140 between the outer edge of the rotor core 100 and the mounting hole 120. The rotor core 100 is sectioned along an axial direction perpendicular to the rotor core 100. In the section, the contour of the weight-reducing hole 140 includes an arc and / or a line segment. The number of the weight-reducing holes 140 is greater than or equal to p, where p is the number of pole pairs of the motor 10.

[0235] Optionally, the number of the bearing 300 is at least one, the bearing 300 is located between the end of the rotating shaft 200 and the rotor core 100 , and the bearing 300 is interference fit with the rotating shaft 200 .

[0236] Optionally, the elastic part 600 is sleeved on the rotating shaft 200, and the bearing 300 is located between the elastic part 600 and the rotor core 100, and the elastic part 600 is used to apply axial preload to the bearing 300. The elastic part 600 includes a wave washer or a retaining spring, etc., which are not listed here one by one.

[0237] Optionally, the axial clearance of the bearing 300 is denoted as σ, where σ≤0.05 mm.

[0238] The bearing 300 is a rolling bearing, and further, the bearing 300 is a four-point contact ball bearing.

[0239] The present application adopts four-point contact ball bearings to enhance the overall deformation resistance of the rotor core 100, multiple permanent magnets 500, the rotating shaft 200 and the bearing 300, which can reduce the axial movement of the motor 10 during operation. In this way, the vibration performance of the motor 10 during operation is improved, and the vibration noise of the motor 10 can be further reduced.

[0240] In the core group 110 , there is a skew angle between two adjacent core segments 112 , and the skew angle is denoted as θ.

[0241] Taking a 12-slot 8-pole motor as an example, the harmonic of the cogging torque of the Z1 slot 2×p pole motor is mainly Nc=LCM(Z1, 2×p) times, so for the 12-slot 8-pole motor, the harmonic of the cogging torque is mainly 24 times.

[0242] Since the motor 10 has magnetic leakage, the magnetic leakage will cause a cogging torque difference.

[0243] To this end, the present application defines θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤|Δθ / θ0|<0.3, so as to effectively reduce the harmonics of the cogging torque that are not eliminated, thereby effectively reducing the cogging torque of the motor 10. On the basis of the electromagnetic torque of the motor 10 remaining basically unchanged, the cogging torque can be greatly reduced, thereby further improving the performance and market competitiveness of the motor 10.

[0244] In this application, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0245] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A motor, characterized in that: include: A rotor core, wherein the rotor core comprises a core group, the core group comprises a plurality of core segments, the plurality of core segments are stacked, any two adjacent core segments are staggered in a clockwise direction or in a counterclockwise direction, and the rotor core is provided with a mounting hole, the mounting hole passes through the core group along the axial direction of the rotor core; A rotating shaft is passed through the mounting hole; A bearing, sleeved on a portion of the rotating shaft located outside the rotor core; Wherein, the bearing is a four-point contact ball bearing; The core segment comprises a plurality of stacked rotor punchings, the rotor core is provided with a connecting structure, and any two adjacent rotor punchings are connected by the connecting structure; The number k of the connection structures is greater than or equal to 2×p, the k connection structures are arranged at intervals along the circumference of the mounting hole, and p is the number of pole pairs of the motor.

2. The motor according to claim 1, characterized in that There are multiple core groups, and the multiple core groups are stacked; Of the two adjacent core groups, one of the core groups is recorded as a first core group, and the other core group is recorded as a second core group; The staggered angle between the two core segments disposed opposite to each other in the first core group and the second core group is greater than 0°, or the outer edges of the two core segments disposed opposite to each other in the first core group and the second core group overlap; In the first core group, any two adjacent core segments are staggered in a clockwise direction, and the staggered angle between any two adjacent core segments is denoted as θ1; In the second core group, any two adjacent core segments are staggered in a counterclockwise direction, and the staggered angle between any two adjacent core segments is denoted as θ2; Among them, θ1 and θ2 are not equal.

3. The motor according to claim 1 or 2, characterized in that: There are multiple bearings, some of which are located on a first axial side of the rotor core, and another part of which are located on a second axial side of the rotor core.

4. The motor according to claim 1 or 2, characterized in that: The connection structure comprises a convex portion and a concave portion, the concave portion is provided on the axial end surface of the first side of the rotor punching, and the convex portion is provided on the axial end surface of the second side of the rotor punching; In two adjacent rotor punchings, the convex portion of one rotor punching is interference fit with the concave portion of the other rotor punching.

5. The motor according to claim 1 or 2, characterized in that: In the core group, the staggered angle between any two adjacent core segments in the clockwise direction or the counterclockwise direction is recorded as θ, the number of core segments is recorded as n, the number of stator slots of the motor is recorded as Z1, and the number of pole pairs of the motor is recorded as p; Among them, θ=θ0+Δθ, θ0=360° / (n×Nc), 0≤∣Δθ / θ0|<0.3, Nc=LCM (Z1, 2×p), n≥2.

6. The motor according to claim 1 or 2, characterized in that: At least a portion of the hole wall of the mounting hole is interference fit with the rotating shaft.

7. The motor according to claim 1 or 2, characterized in that: Also includes: A plurality of permanent magnets are disposed on the core segment, and the plurality of permanent magnets are spaced apart along the circumference of the mounting hole; Along the axial direction of the rotor core, the length of the permanent magnet is less than or equal to the length of the core segment.

8. The motor according to claim 1 or 2, characterized in that: The rotor core is provided with a plurality of weight-reducing holes, which are arranged at intervals in the circumferential direction of the rotating shaft, and the number of the weight-reducing holes is greater than or equal to the number of pole pairs of the motor.

9. The motor according to claim 8, characterized in that The rotor core is cross-sectioned along an axial direction perpendicular to the rotor core. In the cross-section, the contour line of the lightening hole includes an arc and / or a line segment.

10. The motor according to claim 1 or 2, characterized in that: The bearing is interference fit with the rotating shaft.

11. The motor according to claim 1 or 2, characterized in that: Also includes: The elastic part is sleeved on the rotating shaft, and the bearing is located between the elastic part and the rotor core. The elastic part is used to apply an axial preload force to the bearing.

12. The motor according to claim 11, characterized in that The axial clearance of the bearing is less than or equal to 0.05 mm.

13. A chassis system, characterized in that: include: An electric machine as claimed in any one of claims 1 to 12.

14. A vehicle, characterized in that: include: The electric machine according to any one of claims 1 to 12; or The chassis system of claim 13.

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